Mobile terminal with at least two transducers
AssigneeDRNC Holdings, Inc.
InventorsGerard Douhet, Stephane Dufosse, Alain Guillotin
Life of this patent
Estimating the term…
Abstract
The invention concerns a mobile terminal with at least two transducers (LSm, LSs1, LSS2) used simultaneously as loudspeakers for stereophonic effect. According to the invention, one of said transducers is a main transducer (LSm) with a main working frequency band (Bm) corresponding to at least the phone frequency band, while the other transducer is a secondary transducer (LSs1; LSs2) with a secondary working frequency band (Bs1; Bs2) band different from said main frequency band, the lowest frequencies of said secondary working frequency band (Bs1; Bs2) being greater than the lowest frequencies of said main working frequency band.
Claims14
A mobile terminal comprising:
- a housing comprising a first region defining a first cavity and a second region defining a second cavity;
- a first transducer operable to reproduce signals having frequencies within a first working frequency band corresponding to at least a phone frequency band and when positioned adjacent to the first region of the housing seals the first cavity defining an airtight cavity in such a way as to reduce acoustic short circuits due to a recombination of sound waves originating from both a rear side and a front side of the first transducer;
- and
- a second transducer operable to reproduce signals having frequencies within a second working frequency band different from the first working frequency band and when positioned adjacent to the second region of the housing, does not seal the second cavity such that the second cavity is not airtight,
- wherein:
- a lowest frequency of the second working frequency band is greater than a lowest frequency of the first working frequency band, and the first and second transducers are configured to be activated simultaneously as loudspeakers to provide a stereophonic effect,
- the first transducer is positioned adjacent to the first region to seal the first cavity, and faces in a first direction, and
- the second transducer is positioned adjacent to the second cavity, and faces in a second direction different from the first direction.
A mobile terminal comprising:
- a main transducer disposed to provide an airtight cavity and operable to reproduce signals having frequencies a first working frequency band corresponding to at least a phone frequency band;
- at least one secondary transducer disposed to provide a non-airtight cavity and operable to reproduce signals having frequencies within a second working frequency band different from the first working frequency band, wherein a lowest frequency of the second working frequency band is greater than a lowest frequency of the first working frequency band, and the main and the at least one secondary transducers are configured to be activated simultaneously as loudspeakers to provide a stereophonic effect;
- and
- at least one frequency filter, each frequency filter configured to separately filter a different portion of a stereo signal and to deliver the different portion of the stereo signal to a respective one of the at least one secondary transducer via a separate channel,
- wherein the main transducer is positioned adjacent to the airtight cavity to seal the airtight cavity, and faces in a first direction, and
- the at least one secondary transducer is positioned adjacent to the non-airtight cavity, and faces in a second direction different from the first direction.
Dependencies are inferred from the claim text.